[time-nuts] Improving the stability of crystal oscillators

[Bruce Griffiths]

Neville Michie wrote:
>
> If you use a transistor as a heater, the full supply voltage is  
> across the
> element all the time, so heating is proportional to the current flowing.
>
> Neville
>   
Neville

However using a transistor has the disadvantage of a small area heat
source rather than the large area heat source possible with a heater
winding.
Using a small area heat source produces significant temperature gradients.

Bruce